When photoshop starts beach balling, it's sometimes possible to get it to start
responding without having to force-quit it and lose all of your work.

The operating system will typically send a signal to the photoshop process to
pause it, if the operating system is having problems. These "problems" include
running low on RAM, running low on disk space, or using 100% CPU.

After you alleviate the "problems" mentioned above, running this program will send
a SIGCONT signal to the photoshop process to tell it to continue operating.